Lionel Cranfield Sackville, 1st Duke Of Dorset (January 18, 1688 - October 10, 1765) was an English political leader and Lord Lieutenant of Ireland. Lionel was the son of Charles Sackville, 6th Earl of Dorset and Mary Compton Sackville. He married Elizabeth Colyear, the daughter of General Walter Colyear, in January of 1709. Their sons included Charles, John Philip, and George (1716-1785). Lord Sackville served twice as the King's representative (Lord Lieutenant) in Ireland, from 1731 to 1737 and again from 1751 to 1755.

|- style="text-align: center;" | width="30%" |Preceded by:
The Duke of Argyll | width="40%" style="text-align: center;" |Lord Steward
1725–1730 | width="30%" |Succeeded by:
The Earl of Chesterfield

|- style="text-align: center;" | width="30%" |Preceded by:
The Lord King | width="40%" style="text-align: center;" |Lord High Steward
1727 | width="30%" |Succeeded by:
The Lord Hardwicke

|- style="text-align: center;" | width="30%" |Preceded by:
The Earl of Leicester | width="40%" style="text-align: center;" |Lord Warden of the Cinque Ports
1727–1765 | width="30%" |Succeeded by:
The Earl of Holdernesse

|- style="text-align: center;" | width="30%" |Preceded by:
The Lord Carteret | width="40%" style="text-align: center;" |Lord Lieutenant of Ireland
1730–1737 | width="30%" |Succeeded by:
The Duke of Devonshire

|- style="text-align: center;" | width="30%" |Preceded by:
The Duke of Devonshire | width="40%" style="text-align: center;" |Lord Steward
1737–1744 | width="30%" |Succeeded by:
The Duke of Devonshire

|- style="text-align: center;" | width="30%" |Preceded by:
The Earl of Harrington | width="40%" style="text-align: center;" |Lord President of the Council
1745–1751 | width="30%" |Succeeded by:
The Earl Granville

|- style="text-align: center;" | width="30%" |Preceded by:
The Earl of Rockingham | width="40%" style="text-align: center;" |Lord Lieutenant of Kent
1746–1765 | width="30%" |Succeeded by:
The Duke of Dorset

|- style="text-align: center;" | width="30%" |Preceded by:
The Earl of Harrington | width="40%" style="text-align: center;" |Lord Lieutenant of Ireland
1750–1755 | width="30%" |Succeeded by:
Marquess of Hartington

|- style="text-align: center;" | width="30%" |Preceded by:
Marquess of Hartington | width="40%" style="text-align: center;" |Master of the Horse
1755–1757 | width="30%" |Succeeded by:
The Earl Gower